Boiler furnace



March 10, 1931. VAN BRUNT 1,795,383

BOiLER FURNACE Filed March 26, 1926 2 Sheets-Sheet 1 IN VEN TORATTQRNEY5 I Malth 10, 1931. VAN BUNT 1,795,383

BOILER FURNACE Filed March 26 5 2 Sheets-Sheet 2 IN VEN TOR A TTORNEYSPatented Mar. 10, 1931 J'OHN VAN BRUNEI, OF FLUSHING,

BUSTION ENGINEERING CORRORATION, OF NEW YORK,

DELAWARE The invention relates to boiler furnaces and is especiallyuseful where the fuel to be burned is in finely divided form such aspulverized fuel.

One of the primary objects of the invention is to greatly increase thecapacity of a boiler of the cross drum type without materiallyincreasing the size of the installation.

By my invention I propose by an improved l0 novel arrangement of a crossdrum boiler and a combustion chamber therefor to convert an ordinarycross drum boiler installation into a high capacity boiler installation,or construct a new installation from parts heretofore used inconstructing the standard forms of boilers of this class. 1

The invention is particularly useful, although not necessarilyrestricted to, the converting of sectional header substantiallyhorizontal water tube boilers in connection with which it will bedescribed.

Other objects and advantages of my invention will be set forthhereinafter as they will be more readily understood in connection withthe description of the invention.

How the foregoing, together with such other objects as may be incidentto my invention, are realized is illustrated in preferred form in theaccompanying drawings,

wherein- Fig. 1 is a vertical section throu h a boiler furnace embodyingthe preferre form of my invention;

Fig. 2 is a the line 2-2 of Fig. 1;

Fig. 3 is a modified form of downcoiner connection between the crossdrum and the lower drum of the tubular rear wall of the combustionchamber;

Fig. 4 shows a modified arrangement of the offtake; and

Fig. 5 is a cross section through several of the finned tubes which Iemploy to form the walls of the combustion chamber.

Referring nowto the drawings and parfragmentary section taken on NEWYORK, ASSIGNOR TO INTERNATIONAL GOI- N'. Y., A CORPORATION 0] 301mmsummer:

Application filed March 26, 1928. Serial No. 97,!51. I j ticularly toFig. 1, it will be seen that I provide a combustion chamber A the wallsof which 'are largely defined by water tubes,

beneath a boiler B of the cross drum type. a

The boiler B comprises in general the cross drum 5; the bank of'tubes 6,each vertical row of which is connected into a rear header 7 and a frontheader 8 said headersbein'g of any standard form, either straight orsmuous; tubes 9, of the section of tubes C, connected between the drum 5and the front headers 8; and finned downcomer tubeslO connecting thedrum with the rear headers 71 In addition to the tubes 9 the sectionoftubes C includes tubes 10 connecting'the drum 5 with the front header11 into which header the upper headers of the tubular side walls of thecombustion chamber connect as will presently appear. 'A superheater D islocated between the bank of-tubes 6 and the section of tubes C.

It is to be noted thatalternate headers of the front headers 8'extendabove the adjacent ones whereby spaces are provided therebetween for thetubes 10 which extend from the drum 5 to the cross header 11.

The combustion chamber A comprises a front and rear tubular water wall Eand F respectively, side tubular water walls G only one of which isshown in the drawings the other one being of the same construction, andtoprplnd bottom screens H and I respectively. e rear wall F is formed offinned tubes 12 connected at their upper ends into the upper crossheader 13 located adjacent the rear headers 7 of the bank of tubes 6 andat their lower ends into the lower drum 14. The front wall E is formedof finned tubes 15 one for each of the headers 8 of the bank of tubes 6into which headers 8 they are connected at their upper ends. The tubes15 connect at their lower ends into the cross header 16. The side wallsG are formed of finned tubes 17 connected at their upper ends into theupper cross headers 18 located opposite the cross respectively areformed of spaced tubes 20 and 21, the tubes 20 of the upper screenconnecting the upper header 13 of the rear wall with the front headers 8of the bank of tubes and the tubes 21 of the lower screen connecting thelower headers 16 and 14 of the front and rear walls respectively. p

A downcomer pipe 22 connects the cross drum 5 with the lower drum 14 ofthe front wall E by virtue of which and by the interconnection of thetubes of the end walls and the tubes of the top and bottom screensthecirculation will be downward from the drum 5 to the drum 14 and upwardthru the tubes 12 and 20 to the headers 8 and also upward thru the tubes21 and 15 to the headers 8. In the arrangement shown in Fig. 1 it ispreferable to provide one of the downcomer pipes at each end of the drum5 and the drum 14. In Fig. 3 I have shown a modified form of downcomerconnection in which a plurality of small diameter pipes 22a 'areemployed. The circulation of the cross drum boiler B is from the rearheaders 7 to the front headers 8 by virtue of the downcomer connections10 from which it will be seen that the circulation of both the boilerand the above mentioned tubular screens is toward the front headers 8 ofthe boiler B. The circulation thru the tubes of the section C is fromthe front headers 8 and 11 to the cross drum 5.

In connection with the side walls G it is pointed out that the lowerheaders thereof are connected into the lower drum 14 of the tion air issupplied around the burners 23 from an air heater (not shown) located inthe stack or ofi'take 24 which ofitake is shown in Fig. 1 as beinglocated above the boiler B and above the economizer section C. A conduit25 is led from the air heater to the casin 26 thru the medium of whichthe air-is supp ied around the burners; The preheated combustion airincreases the furnace temperature head, and since the combustion chamberis defined by water tubes exposed to radiant heat there is a very rapidtransfer of heat.

The products of combustion are drawn thru the top screen H and the bankof tubes 6,

thence thru the su erheater, thence thru the integral section andfinally thru the air preheater in the stack or olftake. Thus it will beseen that these parts are subjected to the hot gases, the top screen Hhowever being exposed to radiant heat.

In Fig. 4 I have shown a modification in which the ofi'take 24aislocated directly beneath the cross drum 5.

From the foregoing it will be apparent that I am enabled to greatlyincrease the capacity of a cross drum boiler installation by convertingit into a boiler furnace, and this for introducing fuel and air underconditions to produce violentand intense combustion, an ofitake abovesaid bank of tubes for drawing off the products of'combustion; saidcombustion chamber including side walls formed of water tubes andheaders at each end into which they are connected, a front wall formedof upright water tubes and a header at their lower ends into which theyare connected and being connected at their upper ends to the frontheaders of aforesaid bank of tubes, a rear wall formed of upright watertubes and a drum at their lower ends and a header at their upper endsinto which they are con.- nected, s aced tubes marginal of the top ofsaid combustion chamber connecting the upper header of the rear walltubes to the front headers of the bank of tubes and spaced tubesmarginal of the bottom of said combustion chamber connecting the lowerheader of the front wall tubes with the lower drum of the rear walltubes; a downcomer connection between the drum of the cross drum boilerand the lower drum of the rear wall; an upcomer connection between theheaders at one end of the side wall tubes and the drum; and means forconnecting the headers at the other end of the side wall tubes to thelower drum of the rear wall tubes.

2. A boiler'furnace comprising in combination a boiler of the cross drumtype having a bank of substantially horizontal' tubes each vertical rowof which is connected into a front and rearheader, a combustion chambertherebelow largely defined by tubular water walls comprising a frontwall formed of finned tubes and a header below the aforesaid frontheaders said tubes connecting said lower troducin and rear header,

header and said front headers, a rear wall formed of finned tubes, anupper cross header therefor adjacent the aforesaid rear headers, and alower cross drum therefor, side walls formed of finned tubes, uppercross headers therefor opposite the cross drum boiler and lower crossheaders therefor, and a bottom screen of spaced tubes connecting thelower header of the front wall with the ower drum of the rear wall,means connecting the upper header of the rear wall with the frontheaders of the cross drum boiler, a downcomer connection from the crossdrum boiler to said lower drum and an upcomer connection from the upperheaders of the side walls to the boiler, the lower headers of the sidewalls being connected with said drum, and means for mfuel to be burnedin suspension in said com ustion chamber.

3. The combination cross drum type havin the usual drum and a bank ofsubstantially orizontal tubes, each vertical row of which is connectedinto a front alternate headers of said front headers extending upwardlybeyond the ad 'acent ones, water tubes connecting the cross rum withsaid front headers, a water wall, a cross header, said water wall beingconnected to said cross header, and water tubes :onnectin the cross drumwith the cross header said tu s passing thru the spaces between saidalternate upwardl extending headers above said adjacent hea era.

4. A boiler furnace comprisingyin combination, a boiler of the crossdrum type having the usual drum and a bank of substantially horizontaltubes and their headers, a com-' bustion chamber beneath said cross drumboiler, said combustion chamber including end tubular water walls andspaced water tubes marginal of the top and bottom thereof, header meansfor connecting the bottom tubes with the tubes of the end Water walls,header means for connecting the top tubes at one end with the tubes ofone end wall, said top tubes being atvtheir other ends connected to thecross drum boiler, and means for introducing fuel to be burned insuspension in said combustion chamber.

5. A boiler furnace comprising, in combination, a boiler of the crossdrum type having the usual drum and a bank of substantial-1 lyhorizontal tubes and their headers, a combustion chamber beneath saidcross drum boiler, said combustion chamber including side and endtubular water walls and spaced water tubes marginal of the top andbottomthereof, header means for connecting the bottom tubes with the tubes ofthe end water walls, header means for connecting the top tubes at oneend with the tubes of one end Wall, said top tubes at their other endsbeing connected to the cross drum boiler and the tubes of the other endwall being connected to the cross drum boiler, header means into whichthe with a boiler of the d in name. slgne y JOHN VAN BRUNT.

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